BELL JAR n.
A glass vessel, varying in size, open at the bottom and closed at the top like a bell, and having a knob or handle at the top for lifting it. It is used for a great variety of purposes; as, with the air pump, and for holding gases, also for keeping the dust from articles exposed to view.
BENZENE n.
rarely, to a similar mixed product of petroleum. Benzene nucleus, Benzene ring (Chem.), a closed chain or ring, consisting of six carbon atoms, each with one hydrogen atom attached, regarded as the type from which the aromatic compounds are derived. This ring formula is provisionally accepted as representing the probab…
BLIND a.
failing to produce flowers or fruit; as, blind buds; blind flowers. Blind alley, an alley closed at one end; a cul-de-sac. -- Blind axle, an axle which turns but does not communicate motion. Knight. -- Blind beetle, one of the insects apt to fly against people, esp. at night. -- Blind cat (Zoöl.), a species of catfi…
BLOCK n.
A square, or portion of a city inclosed by streets, whether occupied by buildings or not. The new city was laid out in rectangular blocks, each block containing thirty building lots. Such an average block, comprising 282 houses and covering nine acres of ground, exists in Oxford Street. Lond. Quart. Rev.…
BOIL n.
painful, inflamed tumor, which, on suppuration, discharges pus, mixed with blood, and discloses a small fibrous mass of dead tissue, called the core. A blind boil, one that suppurates imperfectly, or fails to come to a head. -- Delhi boil (Med.), a peculiar affection of the skin, probably parasitic in origin, prevail…